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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c9577dff1ad8d2b5087af30e43aa46bc767ddb5e208b4e26bf425061c7fd6a' 
  AND token = 'BCLpkrGtMMt8m+azs0d7gJHBuzn6PBN+v5Yk4c1HL5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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