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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e60e2a5632222f16c033537566274bc234ea2c1914f63cf1c1ab896ea40bb6' 
  AND token = '+f4mr8JXSlxbTE6a2ZkPHw2+MVp+H7f6YNI4F/5cxVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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