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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf9f7e7747a9264f6d17b7819f4fb20a0a97a2dfa8475f9602e6c96147ac7d5' 
  AND token = 'v9q3BJWHD1UA3ySqLdcJtOvzUAqdHbuq9NFeN4lHJzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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