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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd9f94b1964ac2d75347f89496463aa0134bdbb149070b716457cb9b4760ee1' 
  AND token = 'UoMp+YgiPzR2YlpjVhlfuZYtldfQ4DNFMF2oRh3/sa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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