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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7051f38df9996f06d044b39e342740693e51cb1a9d39cc0e6d8b0d19d93d5f4' 
  AND token = 'dJSTzpkddr6Nm7fOMKnkBk/cIXlHU7zl2NLBiu1QifI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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