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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85efb71462bcafcaf2a3c50107ed485dfae0f68505720f92bc4d4ea7af7a8b0f' 
  AND token = 'yo0EgcyEO4n5MdGmrNesQQttIQdqtPyWncDE8QMks68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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