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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dacdf8bff2ae6835eede431ae576663accbc2ad0fc062bf0fa87d5b8b1e9107a' 
  AND token = 'F3pB34gHSaCTJL1PjOPerOTcdN0KBAsK0Cr7uzWUQ7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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