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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da975747408845e377d080210b423b1d36b7d5375645df4a7dc67d68a4baff3d' 
  AND token = 'bDVJxLuiYkMzh1ANg2QLnwdd3Ge3E39Nej5v+SywP/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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