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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3377a742564b23fac44be75c3b8de2b2d46b83ff930adbce11ab24cd40915c82' 
  AND token = '4gLTJEdXxtFl/tGcCtaXrlLQJ2QFjR6Y3n8hJ690Y6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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