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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3fa6e3e3171d7a0e8a3957af2902c4eb45c0e779b9b651a2a3d55531150923' 
  AND token = 'WguSDjB4oJO7iQhFbaztKy+zgQQ1OpSKFgr1Vxv99oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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