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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7be95695b3c23a6227a4b9d920b1b9651a72f911918d955113001eec6b66b7e' 
  AND token = 'dOOkdp/2HPdtH8yaEkAiLv0gA5LLIFVZ9Sv9hwRExuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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