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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c342d0d8d0273459dea5d4f791564b6b7482af3770e5a6423921664c7124ca50' 
  AND token = 'AeiHx6ubI3ENd2IVB/IOz0y+DCdR293w/xmRwt2wB7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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