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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8beffa51affbe7a0443acbd36a5df2970acce1a72456b757bb7f95c52727dcd' 
  AND token = 'FGgIFd9DU1w2zl46/e0IFcA+pm1icE8CfcvnE0PtcK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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