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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a14a323390a27038b11c1ee9ce11a8cbf5c755f081563ef3cda7386c290c20' 
  AND token = 'do7Wks2M48c1VWdaKO7GtzzF/2NvlC/+94aftKeGj5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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