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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847fd2e0aa6f18e03f2f3e681fb9408d183c6f95aa0d487a5e8390640b01fc88' 
  AND token = 'yBLbeIBZd9L+mRv+qHuFuxRPVTE3tJkvROWg4aTHA6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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