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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc06122c56f06f2068f7fcbbe4e5cdfed7d252489658bcc3a36c598b219938e5' 
  AND token = 'AT/rs7HUO8C+d4f4eAF5QFM8AYTN/JSmGR13ZOFWT+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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