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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e3d0375d0296b5ac375ae0b748aac6f86d32b214a72011ec8b0e8e61224e21' 
  AND token = 'DOzX23DnXFX2WylMmxIpf5LqWSve3t6P09vQ6llJr68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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