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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4964a96921883e62e0f9f46ea1c6165c72cd0c6fbc5adda9480b68341eede78d' 
  AND token = 'cGfiBuOVU01Eq/KXmu64JDgeqp33g5K2Z14ffTVntPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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