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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3882c1e20f6158b99c77c21990468110c8481852beaf1fbf29813a09955d172' 
  AND token = 'H1Rehh+pSFQzsFUvIeH7xfz1kZ7noXDQ7kpUbSDM8+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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