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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0801bdf3a56d354d731a57f7cc1419a2768ef125ba2322738e74d07fb2aa31ef' 
  AND token = 'UMbeMrUSLW4NEeaODb8ABh6LA2n3Dcqwec+Yhvqf61U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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