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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3690f94008d8127744da5c2f8776efd4238476ed74895e35a6157824aa99c7' 
  AND token = 'QRyHZZ8Efkd/erjQZUVb3gMstg9JIpjtKleaLY/eTGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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