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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c884ab9a2345baa323e34a71b4dbe0f1edb87dc9734275d60c1fe69b7bfe18dd' 
  AND token = 'XWM77/R8FY9E2P9SYfPZZ1jU+O/LlZ+EKsasG4XQl8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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