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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10cc2ce24b7476dc1e9dc04ee8652263c70c8124091ee68c4b3bb7a32410372a' 
  AND token = 'jMQN3+jeVcNxi+KxIjx22lnZmx5ObwxtzTs9tr54qE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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