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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f8ded0f3e5cb6830418b69255a8eccfffeb297fb60d7fc531f216c40a480f69' 
  AND token = 'dvYUx0Cl/wasO4W0lLEsl5cg9VP2ONbFOTTowVAxAnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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