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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fe5f8ce3d1c9f90858df9b3b0ab78241a60a0d2480e8fd5c1b92e07e3acd705' 
  AND token = 'EN5nlGMPLeeX7FTq624celWl/XYn4BtfZ/n/Z6xkQhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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