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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175534083e61a23b2093b3cafaa5bc8ba7fa24c9a9d3f67cadd788a39c084600' 
  AND token = 'yy0TEUbx2lDaMO41nmpu2pujCV7gcDB1ZjAhOapBs2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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