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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07109279889a780396ca18eb7dab180315d0648e0a1ec758dd36085347895e10' 
  AND token = 'mPo63fyncQxRCxabaVgKsDE3QnvIniv1BPHBJyxMR7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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