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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa67f300cd75b5514288b5cefd735092572590feb90788cd1738b985eb7ba5f' 
  AND token = 'C0J0tfhDMLQaxphqdgxtNNVz7s7zj/RtL/R58NhYP8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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