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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6a9a4cb8a97512babb904efb766bebc13e8455a4a1de2cd84f9c62a9aab421f' 
  AND token = 'aGYfQAjTsWQLDK8axzjlAvNLl/Itjngm3BJh56cBRw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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