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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b585a31d5f13a69d8fd2f1205af5f7794d0ac961198ebcf0cfb3b332a45d1654' 
  AND token = 'qM7BI8BnSfmt3p9cHwf4lEzJQjvLMs0f1LiKYK+M10M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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