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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1ba0e7b6116add0e32b8f64d8bd488d52781aacca4810877e61f4b597ee3e09' 
  AND token = 'gCn8rkBJWis5emjHW420c6xEDoMYzMuOU7eiheuph1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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