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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70123de8dd55ea9c53be0d238e57f575418a066ffeace9b719ff959838d21b5f' 
  AND token = 'un3/1TT0DFH1n3cmZaOfvYyDqeKayu1oiz1LlFvBIaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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