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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ab9c77ffa8f2bcaa05203cfddb53d9703c0bece3e628ae1c056ab8050f1961' 
  AND token = 'obkwoe7eXV711ig7ZHUmmmd3Fp/I7el97dXjkra95gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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