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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4f7ad21624d0f6e692418f24b4446f8213e2caf8d82c04660fe4fc358d1f02' 
  AND token = 'naCfKvqZkYoH4D+uU0ljK27KiFIjTUsvX7lRmPOSxEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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