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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '723096fd01bb85cd3cbf9e294f0af9e3b8e629a04d4f4bf08f0c771812c6908e' 
  AND token = 'zKKxFOuHw8xZHzuRp1ni9GVb8N8ZjFEg+MLVoy+WiTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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