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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a09a3363fda27274093acd00f2ff9881eb29c5eb6445150d903067e7984c26' 
  AND token = 'emgVsy8Rk02oz3i0r6EokwRg06JkgjJO36MWfekRV28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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