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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7238f4f8714eee02dd794cd594b02117dc2f7d4d12a57a408ca4da05aa6c1b59' 
  AND token = 'xy8y9jSvBuNP5R7i/y57Ah9UdkZOu4uzuEdbroWLJfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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