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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94025a054f7b7a2e9afa57db986b1a75c25c24af86075806e3db0b785c05455' 
  AND token = 'DFQ7Rm8x5a5SZY89Ox6O7r/IT9KNcBsYydxbJ0+QG4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}