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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '708afd875e26794376660bba554a10a6bf9daf3c4b7bb54985caf41c3e3376eb' 
  AND token = 'olQMsKJ2iW0Tidm04Z3Q9NAvZS1/CBN67QpMH7Vrc+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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