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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8039e83bacd9b7aa7952414439c04babea22291df75512e593505353a7dc5dcd' 
  AND token = '1C9klPCl5uSpm9V+Vxt1wkMegxsm3Io2lT8gej0ZVKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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