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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503191dd438c19f1a5400e6da30d8f2c53b778382886744c2a7ca7d46a3b186d' 
  AND token = '9OimUwTLQH1baYZzSHP6qqzvM9hQ5ce/+m8u5N0MT3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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