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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdf031c7306a2901881c9d4e3f41bf617bb2f66e115d9bb661b699be756ae403' 
  AND token = '1YfZhb0tgKUEjTJxQESjjUIQXRrneoYKyUyiL+zebZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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