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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c208973d63702a31fa1d34b14421a03d377cdc7c42d8ca74a74acd183404985d' 
  AND token = 'lb7FnxrO2B17LoawibHh0dXfGM6gE84LJ9usaDL83J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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