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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19cccaa52a8e512992a807a43f2ce9b02cbbc99340e9d5e1a078e3fe51cd1d6' 
  AND token = 'bvWF1nUNXVrLew29Hrl2RvSftpL+UuT3mkiPI7Qdctk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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