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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf80107f61861ded99e3818d83b9a5a00a4b6a8fec1f7b7314fea1e6a339e24a' 
  AND token = 'cKZI/oO6rualjp8psPg7kLZL4bUB9IxcOvZjg59wN/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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