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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b36e639ed81608268796390d33f343231f78667f49d9de41bfcb9f81097652' 
  AND token = 'ckeJ5b+dFztbz6RAxVQB9qvNNl0EWAOb6zxVdJVwv4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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