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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '880e86ede8b3498b36b928dae7f1a0d7144575c9513ef97127f96f70d4aa542b' 
  AND token = 'gfw3MizkPuraRuIu5fcMlopho+WtZtwQe17YHM3fCNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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