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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f0adc41474af1594a62bec27101fb30ae2abf4f04e9b2ed57cb1b6931181ac2' 
  AND token = 'F5i6+qONgcc9nZt0neDqE3+ciPgenGXV0RFV77TdaVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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