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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ed5bb7972845e998a9798ff0f2c1e51ace775a41b3afa57cfd0fb4a98f4c51' 
  AND token = 'K7JhSiBIO3q653gFdES3nEfTfzoVUsx7j3JneSGmbZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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