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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09f22cc5a7def3cef76f730e6ec8e2b47cf5c090855991a24bf2625a85d36c1' 
  AND token = 'b677tgDQC0HJUgQrdfVEJc8NyVEsO/8s0AXxRd23cPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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