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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36007f84e18ed13024f2451480bc9df3c2c6b0dfffa3e80c1109643b569fb46' 
  AND token = 'EpMG18wjs5X4omYeXza1E4cCp7yqw8EP8DTCUg6Ezuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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