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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077851415dfab00b36a1640a7e85da942518a494fcd3c64e593ae2a849648213' 
  AND token = 'va5l9nwaH6HbDBR4J38xdauNbILcRX7wDtrNZVcuqR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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