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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e17da1406cc66efc86c1b0ece0c764d9c79ca74026d8ea4696ec400ec1dc5d9' 
  AND token = '+dPA7sax+Hiabk83PwESCigY0UR+SV51EHLUWGZ416Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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