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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31321e8b1db797320ee47fd3927ab7f11a00b693672851476c17c60e11d5f13c' 
  AND token = '9nsvAntCuto/CDW+vi4RP8jHZvzM5qz3vfrwY1ZVHcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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