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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '436719f695917e998c7a529d572d0eb4a599855e16e11205cc3eb94c5d138060' 
  AND token = 'aSJvxVl8hDpn+soTCVsscPuB1hai/94e7pne0JpTYPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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