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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a7fab2eb891d5afefc53e9abfbafe33227cd9a5cefd7242b8aefda654688c5' 
  AND token = 'zjtkxJMpMX+tqURz4JzqUt/BrldgsygZ03O9UzVLo9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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