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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d1bfe968814bfa1b080ba15b14b50105f1912589bbcf141d564facb8545da8e' 
  AND token = '8ZTlWQXVETuLjXlZw7QaNFXfc24Fj7b+wx+NrzoTupA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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