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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19dd21a73dc0de8059b67e502e9a2030c13a4feb3fc563d9a788a68b390784bd' 
  AND token = 'F7qd6wDLW7ZmQ3LZbbRR6OHn8sUoTSVucnt0SNxKpYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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